Europe heatwave prompts rare UK red warning, France power outages and Italy alerts

A late-June heatwave is pushing public-safety systems under pressure across western Europe, with Britain issuing a rare red heat health warning, France recording its hottest day on record and Italy placing multiple cities on high alert.

The Met Office warning covers much of central and southern England and Wales. AP reported that forecasters expected temperatures to reach as high as 38C in parts of southern England, with officials warning of severe health risks and wider disruption.

The warning is notable for its scale as well as its timing. Research for this story found the U.K. red alert is only the second such warning ever issued, underscoring how unusually intense the current heat spell has become.

France at the centre of the heatwave

France has been one of the hardest-hit countries. Reporting on Tuesday said the country recorded its hottest day ever, with a national average temperature of 29.8C, and forecasters said much of the country remained braced for highs of around 40C to 42C on Wednesday.

Météo-France placed 58 departments on red alert as the heatwave intensified. Le Monde described the situation as an unprecedented red zone sweeping across Europe, with the country taking on the role of the main focal point for the week’s extreme temperatures.

The heat has also affected daily life beyond the thermometer. Schools, transport and other public services have been disrupted in parts of Europe, adding to the strain on residents trying to get through peak temperatures.

Power outages and grid pressure in France

The heatwave has also hit infrastructure in France. Authorities in western France reported power outages affecting about 68,000 households in Finistère, with the disruption linked by local officials to extreme temperatures and a grid transformer issue.

Le Monde also reported uncertainty around several EDF nuclear reactors because of hot river temperatures, while grid operator RTE said the overall electricity supply remained secure. That combination points to a system under stress without, so far, a nationwide blackout or wider supply crisis.

The outage report and reactor adjustments matter because they show how extreme heat can spill from a weather event into the energy system. Cooling-dependent infrastructure is especially vulnerable when river and air temperatures remain elevated for long periods.

Italy and the eastward spread

The heatwave is not confined to France and the U.K. Italy’s health ministry declared red heat alerts for 16 cities, including Rome, Milan and Florence, as temperatures there were forecast to reach up to 41C in some areas.

Multiple outlets also reported that the hot spell was moving eastward into parts of Poland, Croatia and Hungary later in the week. That raises the prospect of more red alerts, transport restrictions and local emergency measures as conditions shift across the continent.

The developing pattern matters because it broadens the public-safety risk well beyond one country. Health systems, transport operators and local authorities across several regions may have to respond at the same time if the heat holds.

Public-health stakes and what to watch next

The immediate risk is to vulnerable people, including older adults, schoolchildren, people with underlying conditions and outdoor workers exposed to sustained heat. Officials across Europe have been warning that prolonged high temperatures can quickly turn into heat-related illness or other safety incidents.

The heatwave is also creating disruption for travelers and commuters, with rail, road and air networks facing the possibility of delays or operational changes as temperatures rise. In many cases, even short-term impacts can cascade through busy summer travel schedules.

Attention now turns to whether the U.K. warning is extended or upgraded, whether French authorities report more outages or additional grid adjustments, and whether further record temperatures are confirmed later on Wednesday. Officials are also watching to see if more countries add restrictions as the heatwave continues its eastward path.

The broader picture is of an unusually severe early-summer heat event marked by rare warnings, record-setting temperatures and growing pressure on health and energy systems across Europe.